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NORMAN B. CRAWFORD, OF BENINGTON, VERMONT.

Letters ,Patent No. 71,140, dated November 19,' 1867.

IMPROVEMENT IN SGAIFLDS POR ROOFS.

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To ALL WHOM 1T MAY ooNoEnN.:

Be it known that I, NORMAN B. CRAWFORD, of Bennington, in the State ot'Vermont, havey invented and made a certain new and useful Improvement invScaffolds for Roofs; and I do hereby declare the following to be afull, clear, and exact description of the said inventon,`rcfereuce beinghad to the annexed drawing, making part of this specification, whorein-Figure 1 is a plan of said scaffolding, seen at right angles to thesurface of an inclined roof, and

Figure is a side view of said scaffolding as applied to the surface ofan inclined roof.

Similar marks of reference denote the same parts in both figures.

The object of my invention is to facilitate the construction and repairof roofs that stand at an inclination or pitch upon which workmen cannotstand with safety.

My invention consistsin a board or platform that `is level, or nearlyso, and provided with skids beneath it, that are fitted with windlassesto act upon the ropes that suspend thc scaffold, and. a ladder isattached'to and hangs below the platform, to give access to the samefrom the lowest edge of the roof.

In the drawing, a represents a roof of any kind, to which my scaffoldmay be'applied. b is theplatform or board, of suitable length and width,c e are triangular skids, forming supports that rest upon the roof andreceive the platform b on thc upper edges, being firmly attached to saidplatform b, and receiving between them the winch or windlass-barrels d,actuated by cranks e, and 2 are pins inserted in holes to keep the winchfrom turning, except when withdrawn.' ff are ropes passing from thewinch-barrels d to the .pulleys g, and thence back to the platform I1.The pulleysg are sustained by hooks, that pass over the ridge of the'roof, or are attached in any other convenient manner, so that theplatform can be drawn up or lowered by turning the Winches d. Claws orpawls applied at the-back of the skids c, and'attached by hinges, areemployed to steady the scaffold, and where the roof is of wood thepointed ends of these claws may be driven in.. The ladder h isvsuspended from a skid under the platform '6, near the centre; it isattached by a holt, so as to be moved, and it may be formed of sections,so as to be hooked together and extended, as required from timcltf time.

What I claim, and desire to secure by Letters Patent, 'is- The platformZJ, sustained on the skids c c, in combination with the winch-barrels d,ropesj, pulleys g, and claws z', as and for the purposes set forth.

And in combination therewith I claimA the ladder l. applied as and forthe purposes specified.

In witness whereof I have hereunto set my signature, this twentieth dayof September, A. D. 1867.

4 NORMAN B. CRAWFORD.

Witnesses:

Jas. A. N. WrLLIAMs, Jas. B. MEACHAM,

